As a matter of fact, my brother (who knows nothing about finance and stocks) thought the FB IPO was a buy. Of course, when it tanked I thought (like a typical Wall Street asshole would) "contrarian signal, I should have shorted". Yet here we are with the stock at $137 from the IPO price of $38. In some unconcious level he must have thought 'I use this thing everyday, it has a monopoly on people, I could get really rich' and the beauty of unbounded investments like that is that it tends to be 'idiot proof' by its very nature. Because the payoffs are so massive, one can be wrong 70-80%+ of the time and still do pretty well
Like Taleb says
"Take for example the binomial distribution with B[N, p] probability of success (avoidance of failure), with N=50. When p moves from 96% to 99% the probability quadruples. So small imprecision around the probability of success (error in its computation, uncertainty about how we computed the probability) leads to enormous ranges in the total result. This shows that there is no such thing as "measurable risk" in the tails, no matter what model we use.
Case 2: More scary. Take a Gaussian, with the probability of exceeding a certain number, that is, . 1- Cumulative density function.. Assume mean = 0, STD= 1. Change the STD from 1 to 1.1 (underestimation of 10% of the variance). For the famed "six sigmas", the area in the tails explodes by 2400%. For the areas above 10 sigmas (common in economics), the area explodes by trillions."
And that only talks about the probabilities, it doesn't even touch the problems when dealing with the consequences of tails (the payoffs)
A skeptic of certain unbounded equity investments thinks he knows the probabilities associated with the tails as well as the payoffs. That is ridiculous, I'd say MORE ridiculous than a random person thinking they can get rich from a unbounded investment
Equities have positive expected value anyway, its like getting paid to play the lottery (except this lotery has no limit on the payout)